7z has an open architecture, so it can support any new compression method, too. The following methods currently are integrated into 7z:LZMA - Improved and optimized version of LZ77 algorithmPPMD - Dmitry Shkarin's PPMdH with small changesBCJ - Converter for 32-bit x86 executablesBCJ2 - Converter for 32-bit x86 executablesBZip2 - Standard BWT algorithmDeflate - Standard LZ77-based algorithm

LZMA is the default and general compression method of 7z format. The main features of LZMA are:High compression ratioVariable dictionary size (up to 4 GB)Compression speed: about 1 MB/s on 2 GHz CPUDecompression speed: about 10-20 MB/s on 2 GHz CPUSmall memory requirement for decompression (depend from dictionary size)Small code size for decompression: about 5 KBSupports multi-threading and P4's hyper-threading

Whats New :- Installer and SFX modules now use some protection against DLL preloading attack.- Some bugs were fixed in 7z, NSIS, SquashFS and RAR5 code.